Nearly 49% have email accounts for messages they rarely intend to open. That most likely includes marketing messages from senders they don’t trust or care much about. - Acxiom "Email Marketing and Mobile Devices: A Survey of Consumer Habits and Perceptions" (2013)

The average bounce rate for industries with 25-499 members is 2%, for 500-999 members, 1.6% and for 1000 or more members, 1.2%. - MailerMailer "Email Marketing Metrics Report" (2012)

73.2% of emails sent to Windows Live Hotmail addresses arrive in the recipient's inbox. - IBM "Email Deliverability: Use 2011 Benchmarks to Ensure 2012 Results" (2012)

85.7% of emails sent to Gmail addresses arrive in the recipient's inbox; 85.3% of emails sent to Yahoo addresses arrive in the recipient's inbox; 81.8% of emails sent to AOL addresses arrive in the recipient's inbox. - IBM "Email Deliverability: Use 2011 Benchmarks to Ensure 2012 Results" (2012)

Roughly 18% of all commercial email in North America never reached the inbox in 3Q12: 5% landed in spam traps and 13% was blocked or went missing. - Return Path "The Email Intelligence Report Q3 2012" (2012)

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The proportion of companies that know what percentage of their email marketing budget is lost through non-delivery has been gradually decreasing since 2009, down to 12% this year. - Econsultancy "Email Marketing Census 2011" (2011)

Ps that were listed on just one of the top 12 blacklists saw their delivery rates plunge to an average of 35%. - Return Path (2008)

Mailers with unknown-user rates; the percentage of email sent to non-existent addresses - of below 10% achieved 67% deliverability rates on average, while those with unknown-user rates of 10% or higher achieved average delivery rates of 44%. - Return Path (2008)

46% of email traffic comes from hosts "which should not be sending mail at all," such as compromised hosts, dynamic IPs and a variety of other "non-mail servers". - Return Path (2008)

Just 20% of email comes from legitimate servers, or servers that are "real, static" and "well configured". - Return Path (2008)

30% of practicing marketers don't take the time to figure out their actual rate of delivery. - MarketingSherpa "Email Marketing Benchmark Guide 2008" (2008)

Failing an SPF check carries a heavy penalty - nearly 2.4 points from the current SpamAssassin test, on a Bayesian scale that identifies a message as spam when it reaches 3.0 points or higher. - Lyris, Q2 Email Advisory Report Card (2007)

For the first time Sender Policy Framework (SPF) email authentication checks are on the top ten list of content triggers for different ISPs. - Lyris, Q2 Email Advisory Report Card (2007)

53% of those surveyed said they would be more likely to open an email if it had a symbol identifying it as having been certified by a trusted third party. - Email Senderand Provider Coalition (ESPC) (2007)

Marketers sending to European ISPs face even more trouble: More than 20 percent of permission-based emails were sent to the junk/bulk folder - almost three times more than the previous quarter. - Lyris, Q2 Email Advisory Report Card (2007)